Why can't I close an issue without leaving a comment?

We have encountered what appears to be a bug where an issue would not close unless a comment had been left in the comments section. There are not validators on the workflow transition to closed. Why would this be?

Ok, check the list of Behaviours that may be active - on a very old version (before it merged with SR I think), I remember managing to set up a behaviour that would do exactly what you're seeing - it was requiring a comment during transitions, but not telling the user why it wasn't letting them proceed (because I'd made a mess of the config)

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I’m a designer on the Jira team. For a long time, I’ve fielded questions from other designers about how they should be using Jira Software with their design team. I’ve also heard feedback from other ...